Study on abundance or deficiency of soil nutrient and fertilization recommendation index system for garlic

From 2006 to 2012,24 3414 field experiments of garlic were conducted in the city of Linyi,Shandong province.Nutrient abundance or deficiency index system of garlic soil was established according to the correlation between the nutrient contents and relative yield.Fertilization model of nitrogen recommendation was established by method of nutrient balance;the correlation of the optimum amounts of phosphorus and potassium fertilization and soil nutrient was verified according to fertilizer effect functions,fertilization models of phosphorus and potassium were also established recommendation fertilization index system was initially established.The results showed that the recommended dosage of nitrogen fertilizer(N) was 150.0 ~193.5,193.5~228.0,228.0~330.0,330.0~499.5 and 499.5~525.0 kg/hm2when the content of available N at extremely high level(234 mg/kg),high level(200~234 mg/kg),moderate level(125~200 mg/kg),low level(57 ~125 mg/kg) and extremely low level(57 mg/kg),respectively; The recommended dosage of phosphorus fertilizer(P2O5)was 90.0~115.5,115.5~127.5,127.5~165.0,165.0~228.0 and 228.0~255.0 kg/hm2when the content of available P at extremely high level(105 mg/kg),high level(84~105 mg/kg),moderate level(43~84 mg/kg),low level(14~43 mg/kg) and extremely low level(14 mg/kg),respectively; The recommended dosage of potassium fertilizer(K2O)was 180.0~216.0,216.0~238.5,238.5~301.5,301.5~406.5 and 406.5~450.0 kg/hm2when the content of available K at extremely high level(328 mg/kg),high level(257~328 mg/kg),moderate level(124~257 mg/kg),low level(37~124 mg/kg) and extremely low level( 37 mg/kg),respectively.